CVE-2023-34337

BMC compromise via inadequate HMAC strength

Published Jul 5, 2023 · Updated Nov 20, 2024

Inadequate HMAC strength in AMI MegaRAC SP-X allows remote authenticated users to compromise BMC security from an adjacent network. The BMC applies a hash-based message authentication code with inadequate cryptographic strength, but AMI has not disclosed the algorithm, key handling, message locus, or incorrect operation. Exploitation requires low-privileged access, high complexity, and user interaction; success exposes or alters BMC data or interrupts service.

CVSS severity7.6
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inadequate HMAC strength in AMI MegaRAC SP-X allows remote authenticated users to compromise BMC security from an adjacent network. The BMC applies a hash-based message authentication code with inadequate cryptographic strength, but AMI has not disclosed the algorithm, key handling, message locus, or incorrect operation. Exploitation requires low-privileged access, high complexity, and user interaction; success exposes or alters BMC data or interrupts service.

The record

CVE
CVE-2023-34337
Published
Jul 5, 2023
Updated
Nov 20, 2024
Vendor
American Megatrends International
Product
MegaRAC SP-X
Classifications
CWE-326, CAPEC-112, T1110
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.0 <12.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

American Megatrends International · MegaRAC SP-Xversion=12.0 <12.2

Published CVSS scores

7.6AMICVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength
CAPEC-112Brute Force
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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